The vertical dynamic interaction between a railway wheel and a track is investigated experimentally and numerically. Full-scale field experiments performed on a portion of a recently built railway track for high-speed trains are reported. Wheels without and with wheelflats were instrumented for measurement of transient vertical wheel/rail contact forces. Accelerations and strains in the track structure were measured in parallel. The location of the instrumented wheelset in relation to the instrumented portion of the track was determined at each instant of time. A linear mathematical model of the track is suggested. The transient interaction problem is numerically solved by use of an extended state-space vector formulation in conjunction with a complex modal superposition for the track. Track parameters determined at the test-site are used as input to the model. Numerical results show acceptable agreement with measured responses.
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